SPECTROSCOPIC REMOTE-SENSING OF MOLECULAR CONSTITUENTS IN THE ATMOSPHERE BY LASER-RADAR TECHNIQUES BASED ON OPTICAL SCATTERING PHENOMENA
Loading...
Date
1971
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The usefulness of Raman spectroscopy, which is so far recognized as a complementary technique to infrared spectroscopy, can be extended to include various new fields which are unique to itself. The laser-Raman radar scheme detecting the Raman backscattered echoes has been $proposed^{1}$ and confirmed experimentally by the present $authors^{2-4}$, which is capable of measuring remotely the number density of molecular constituents as well as their species existing not only in the ordinary but also in the polluted atmosphere. This paper wishes to report the operational performance and the experimental results, so far obtained, of our laser-Raman radar as a completely single-ended system for the chemical analysis of the real atmosphere. An alternative method, which utilizes a frequency-tunable dye laser with high repetition rate of pulsed operation is also developed to investigate the resonance spectroscopic effects of a variety of molecules and atoms contained in the lower and upper atmosphere. These effects include the fluorescence and the resonance scatterings along with the resonance Raman scattering, and are expected to improve significantly the sensitivity and the range capability for the constituent analysis of our environmental air.
Description
$^{1}$H. Inaba and T. Kobayasi, Nature, 224, 170, (1969). $^{2}$T. Kobayasi and H. Inaba, Appl. Phys. Letters, 17, 139, (1970). $^{3}$H. Inaba and T. Kobayasi. Invited paper to the Sixth International Quantum Electronics Conference, Kyoto, Japan, September 1970. $^{4}$T. Kobayasi and H. Inaba. Proceedings of IEEE., 58, 1568, (1970).""
Author Institution: Research Institute of Electrical Communication, Tohoku University
Author Institution: Research Institute of Electrical Communication, Tohoku University